fs/gfs2/quota.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 /*
   8  * Quota change tags are associated with each transaction that allocates or
   9  * deallocates space.  Those changes are accumulated locally to each node (in a
  10  * per-node file) and then are periodically synced to the quota file.  This
  11  * avoids the bottleneck of constantly touching the quota file, but introduces
  12  * fuzziness in the current usage value of IDs that are being used on different
  13  * nodes in the cluster simultaneously.  So, it is possible for a user on
  14  * multiple nodes to overrun their quota, but that overrun is controlable.
  15  * Since quota tags are part of transactions, there is no need for a quota check
  16  * program to be run on node crashes or anything like that.
  17  *
  18  * There are couple of knobs that let the administrator manage the quota
  19  * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
  20  * sitting on one node before being synced to the quota file.  (The default is
  21  * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
  22  * of quota file syncs increases as the user moves closer to their limit.  The
  23  * more frequent the syncs, the more accurate the quota enforcement, but that
  24  * means that there is more contention between the nodes for the quota file.
  25  * The default value is one.  This sets the maximum theoretical quota overrun
  26  * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
  27  * practice, the maximum overrun you see should be much less.)  A "quota_scale"
  28  * number greater than one makes quota syncs more frequent and reduces the
  29  * maximum overrun.  Numbers less than one (but greater than zero) make quota
  30  * syncs less frequent.
  31  *
  32  * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
  33  * the quota file, so it is not being constantly read.
  34  */
  35
  36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  37
  38 #include <linux/sched.h>
  39 #include <linux/slab.h>
  40 #include <linux/mm.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/completion.h>
  43 #include <linux/buffer_head.h>
  44 #include <linux/sort.h>
  45 #include <linux/fs.h>
  46 #include <linux/bio.h>
  47 #include <linux/gfs2_ondisk.h>
  48 #include <linux/kthread.h>
  49 #include <linux/freezer.h>
  50 #include <linux/quota.h>
  51 #include <linux/dqblk_xfs.h>
  52 #include <linux/lockref.h>
  53 #include <linux/list_lru.h>
  54 #include <linux/rcupdate.h>
  55 #include <linux/rculist_bl.h>
  56 #include <linux/bit_spinlock.h>
  57 #include <linux/jhash.h>
  58 #include <linux/vmalloc.h>
  59
  60 #include "gfs2.h"
  61 #include "incore.h"
  62 #include "bmap.h"
  63 #include "glock.h"
  64 #include "glops.h"
  65 #include "log.h"
  66 #include "meta_io.h"
  67 #include "quota.h"
  68 #include "rgrp.h"
  69 #include "super.h"
  70 #include "trans.h"
  71 #include "inode.h"
  72 #include "util.h"
  73
  74 #define GFS2_QD_HASH_SHIFT      12
  75 #define GFS2_QD_HASH_SIZE       BIT(GFS2_QD_HASH_SHIFT)
  76 #define GFS2_QD_HASH_MASK       (GFS2_QD_HASH_SIZE - 1)
  77
  78 #define QC_CHANGE 0
  79 #define QC_SYNC 1
  80
  81 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
  82 /*                     -> sd_bitmap_lock                              */
  83 static DEFINE_SPINLOCK(qd_lock);
  84 struct list_lru gfs2_qd_lru;
  85
  86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
  87
  88 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
  89                                  const struct kqid qid)
  90 {
  91         unsigned int h;
  92
  93         h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
  94         h = jhash(&qid, sizeof(struct kqid), h);
  95
  96         return h & GFS2_QD_HASH_MASK;
  97 }
  98
  99 static inline void spin_lock_bucket(unsigned int hash)
 100 {
 101         hlist_bl_lock(&qd_hash_table[hash]);
 102 }
 103
 104 static inline void spin_unlock_bucket(unsigned int hash)
 105 {
 106         hlist_bl_unlock(&qd_hash_table[hash]);
 107 }
 108
 109 static void gfs2_qd_dealloc(struct rcu_head *rcu)
 110 {
 111         struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
 112         kmem_cache_free(gfs2_quotad_cachep, qd);
 113 }
 114
 115 static void gfs2_qd_dispose(struct list_head *list)
 116 {
 117         struct gfs2_quota_data *qd;
 118         struct gfs2_sbd *sdp;
 119
 120         while (!list_empty(list)) {
 121                 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
 122                 sdp = qd->qd_gl->gl_name.ln_sbd;
 123
 124                 list_del(&qd->qd_lru);
 125
 126                 /* Free from the filesystem-specific list */
 127                 spin_lock(&qd_lock);
 128                 list_del(&qd->qd_list);
 129                 spin_unlock(&qd_lock);
 130
 131                 spin_lock_bucket(qd->qd_hash);
 132                 hlist_bl_del_rcu(&qd->qd_hlist);
 133                 spin_unlock_bucket(qd->qd_hash);
 134
 135                 gfs2_assert_warn(sdp, !qd->qd_change);
 136                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
 137                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
 138
 139                 gfs2_glock_put(qd->qd_gl);
 140                 atomic_dec(&sdp->sd_quota_count);
 141
 142                 /* Delete it from the common reclaim list */
 143                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
 144         }
 145 }
 146
 147
 148 static enum lru_status gfs2_qd_isolate(struct list_head *item,
 149                 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
 150 {
 151         struct list_head *dispose = arg;
 152         struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
 153
 154         if (!spin_trylock(&qd->qd_lockref.lock))
 155                 return LRU_SKIP;
 156
 157         if (qd->qd_lockref.count == 0) {
 158                 lockref_mark_dead(&qd->qd_lockref);
 159                 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
 160         }
 161
 162         spin_unlock(&qd->qd_lockref.lock);
 163         return LRU_REMOVED;
 164 }
 165
 166 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 167                                          struct shrink_control *sc)
 168 {
 169         LIST_HEAD(dispose);
 170         unsigned long freed;
 171
 172         if (!(sc->gfp_mask & __GFP_FS))
 173                 return SHRINK_STOP;
 174
 175         freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
 176                                      gfs2_qd_isolate, &dispose);
 177
 178         gfs2_qd_dispose(&dispose);
 179
 180         return freed;
 181 }
 182
 183 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
 184                                           struct shrink_control *sc)
 185 {
 186         return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
 187 }
 188
 189 struct shrinker gfs2_qd_shrinker = {
 190         .count_objects = gfs2_qd_shrink_count,
 191         .scan_objects = gfs2_qd_shrink_scan,
 192         .seeks = DEFAULT_SEEKS,
 193         .flags = SHRINKER_NUMA_AWARE,
 194 };
 195
 196
 197 static u64 qd2index(struct gfs2_quota_data *qd)
 198 {
 199         struct kqid qid = qd->qd_id;
 200         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
 201                 ((qid.type == USRQUOTA) ? 0 : 1);
 202 }
 203
 204 static u64 qd2offset(struct gfs2_quota_data *qd)
 205 {
 206         u64 offset;
 207
 208         offset = qd2index(qd);
 209         offset *= sizeof(struct gfs2_quota);
 210
 211         return offset;
 212 }
 213
 214 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
 215 {
 216         struct gfs2_quota_data *qd;
 217         int error;
 218
 219         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
 220         if (!qd)
 221                 return NULL;
 222
 223         qd->qd_sbd = sdp;
 224         qd->qd_lockref.count = 1;
 225         spin_lock_init(&qd->qd_lockref.lock);
 226         qd->qd_id = qid;
 227         qd->qd_slot = -1;
 228         INIT_LIST_HEAD(&qd->qd_lru);
 229         qd->qd_hash = hash;
 230
 231         error = gfs2_glock_get(sdp, qd2index(qd),
 232                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
 233         if (error)
 234                 goto fail;
 235
 236         return qd;
 237
 238 fail:
 239         kmem_cache_free(gfs2_quotad_cachep, qd);
 240         return NULL;
 241 }
 242
 243 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
 244                                                      const struct gfs2_sbd *sdp,
 245                                                      struct kqid qid)
 246 {
 247         struct gfs2_quota_data *qd;
 248         struct hlist_bl_node *h;
 249
 250         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
 251                 if (!qid_eq(qd->qd_id, qid))
 252                         continue;
 253                 if (qd->qd_sbd != sdp)
 254                         continue;
 255                 if (lockref_get_not_dead(&qd->qd_lockref)) {
 256                         list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
 257                         return qd;
 258                 }
 259         }
 260
 261         return NULL;
 262 }
 263
 264
 265 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
 266                   struct gfs2_quota_data **qdp)
 267 {
 268         struct gfs2_quota_data *qd, *new_qd;
 269         unsigned int hash = gfs2_qd_hash(sdp, qid);
 270
 271         rcu_read_lock();
 272         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 273         rcu_read_unlock();
 274
 275         if (qd)
 276                 return 0;
 277
 278         new_qd = qd_alloc(hash, sdp, qid);
 279         if (!new_qd)
 280                 return -ENOMEM;
 281
 282         spin_lock(&qd_lock);
 283         spin_lock_bucket(hash);
 284         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
 285         if (qd == NULL) {
 286                 *qdp = new_qd;
 287                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
 288                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
 289                 atomic_inc(&sdp->sd_quota_count);
 290         }
 291         spin_unlock_bucket(hash);
 292         spin_unlock(&qd_lock);
 293
 294         if (qd) {
 295                 gfs2_glock_put(new_qd->qd_gl);
 296                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
 297         }
 298
 299         return 0;
 300 }
 301
 302
 303 static void qd_hold(struct gfs2_quota_data *qd)
 304 {
 305         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 306         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
 307         lockref_get(&qd->qd_lockref);
 308 }
 309
 310 static void qd_put(struct gfs2_quota_data *qd)
 311 {
 312         if (lockref_put_or_lock(&qd->qd_lockref))
 313                 return;
 314
 315         qd->qd_lockref.count = 0;
 316         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
 317         spin_unlock(&qd->qd_lockref.lock);
 318
 319 }
 320
 321 static int slot_get(struct gfs2_quota_data *qd)
 322 {
 323         struct gfs2_sbd *sdp = qd->qd_sbd;
 324         unsigned int bit;
 325         int error = 0;
 326
 327         spin_lock(&sdp->sd_bitmap_lock);
 328         if (qd->qd_slot_count != 0)
 329                 goto out;
 330
 331         error = -ENOSPC;
 332         bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
 333         if (bit < sdp->sd_quota_slots) {
 334                 set_bit(bit, sdp->sd_quota_bitmap);
 335                 qd->qd_slot = bit;
 336                 error = 0;
 337 out:
 338                 qd->qd_slot_count++;
 339         }
 340         spin_unlock(&sdp->sd_bitmap_lock);
 341
 342         return error;
 343 }
 344
 345 static void slot_hold(struct gfs2_quota_data *qd)
 346 {
 347         struct gfs2_sbd *sdp = qd->qd_sbd;
 348
 349         spin_lock(&sdp->sd_bitmap_lock);
 350         gfs2_assert(sdp, qd->qd_slot_count);
 351         qd->qd_slot_count++;
 352         spin_unlock(&sdp->sd_bitmap_lock);
 353 }
 354
 355 static void slot_put(struct gfs2_quota_data *qd)
 356 {
 357         struct gfs2_sbd *sdp = qd->qd_sbd;
 358
 359         spin_lock(&sdp->sd_bitmap_lock);
 360         gfs2_assert(sdp, qd->qd_slot_count);
 361         if (!--qd->qd_slot_count) {
 362                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
 363                 qd->qd_slot = -1;
 364         }
 365         spin_unlock(&sdp->sd_bitmap_lock);
 366 }
 367
 368 static int bh_get(struct gfs2_quota_data *qd)
 369 {
 370         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 371         struct inode *inode = sdp->sd_qc_inode;
 372         struct gfs2_inode *ip = GFS2_I(inode);
 373         unsigned int block, offset;
 374         struct buffer_head *bh;
 375         struct iomap iomap = { };
 376         int error;
 377
 378         mutex_lock(&sdp->sd_quota_mutex);
 379
 380         if (qd->qd_bh_count++) {
 381                 mutex_unlock(&sdp->sd_quota_mutex);
 382                 return 0;
 383         }
 384
 385         block = qd->qd_slot / sdp->sd_qc_per_block;
 386         offset = qd->qd_slot % sdp->sd_qc_per_block;
 387
 388         error = gfs2_iomap_get(inode,
 389                                (loff_t)block << inode->i_blkbits,
 390                                i_blocksize(inode), &iomap);
 391         if (error)
 392                 goto fail;
 393         error = -ENOENT;
 394         if (iomap.type != IOMAP_MAPPED)
 395                 goto fail;
 396
 397         error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
 398                                DIO_WAIT, 0, &bh);
 399         if (error)
 400                 goto fail;
 401         error = -EIO;
 402         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
 403                 goto fail_brelse;
 404
 405         qd->qd_bh = bh;
 406         qd->qd_bh_qc = (struct gfs2_quota_change *)
 407                 (bh->b_data + sizeof(struct gfs2_meta_header) +
 408                  offset * sizeof(struct gfs2_quota_change));
 409
 410         mutex_unlock(&sdp->sd_quota_mutex);
 411
 412         return 0;
 413
 414 fail_brelse:
 415         brelse(bh);
 416 fail:
 417         qd->qd_bh_count--;
 418         mutex_unlock(&sdp->sd_quota_mutex);
 419         return error;
 420 }
 421
 422 static void bh_put(struct gfs2_quota_data *qd)
 423 {
 424         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 425
 426         mutex_lock(&sdp->sd_quota_mutex);
 427         gfs2_assert(sdp, qd->qd_bh_count);
 428         if (!--qd->qd_bh_count) {
 429                 brelse(qd->qd_bh);
 430                 qd->qd_bh = NULL;
 431                 qd->qd_bh_qc = NULL;
 432         }
 433         mutex_unlock(&sdp->sd_quota_mutex);
 434 }
 435
 436 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
 437                          u64 *sync_gen)
 438 {
 439         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
 440             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
 441             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
 442                 return 0;
 443
 444         if (!lockref_get_not_dead(&qd->qd_lockref))
 445                 return 0;
 446
 447         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
 448         set_bit(QDF_LOCKED, &qd->qd_flags);
 449         qd->qd_change_sync = qd->qd_change;
 450         slot_hold(qd);
 451         return 1;
 452 }
 453
 454 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 455 {
 456         struct gfs2_quota_data *qd = NULL, *iter;
 457         int error;
 458
 459         *qdp = NULL;
 460
 461         if (sb_rdonly(sdp->sd_vfs))
 462                 return 0;
 463
 464         spin_lock(&qd_lock);
 465
 466         list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
 467                 if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
 468                         qd = iter;
 469                         break;
 470                 }
 471         }
 472
 473         spin_unlock(&qd_lock);
 474
 475         if (qd) {
 476                 error = bh_get(qd);
 477                 if (error) {
 478                         clear_bit(QDF_LOCKED, &qd->qd_flags);
 479                         slot_put(qd);
 480                         qd_put(qd);
 481                         return error;
 482                 }
 483         }
 484
 485         *qdp = qd;
 486
 487         return 0;
 488 }
 489
 490 static void qd_unlock(struct gfs2_quota_data *qd)
 491 {
 492         gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
 493                          test_bit(QDF_LOCKED, &qd->qd_flags));
 494         clear_bit(QDF_LOCKED, &qd->qd_flags);
 495         bh_put(qd);
 496         slot_put(qd);
 497         qd_put(qd);
 498 }
 499
 500 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
 501                     struct gfs2_quota_data **qdp)
 502 {
 503         int error;
 504
 505         error = qd_get(sdp, qid, qdp);
 506         if (error)
 507                 return error;
 508
 509         error = slot_get(*qdp);
 510         if (error)
 511                 goto fail;
 512
 513         error = bh_get(*qdp);
 514         if (error)
 515                 goto fail_slot;
 516
 517         return 0;
 518
 519 fail_slot:
 520         slot_put(*qdp);
 521 fail:
 522         qd_put(*qdp);
 523         return error;
 524 }
 525
 526 static void qdsb_put(struct gfs2_quota_data *qd)
 527 {
 528         bh_put(qd);
 529         slot_put(qd);
 530         qd_put(qd);
 531 }
 532
 533 /**
 534  * gfs2_qa_get - make sure we have a quota allocations data structure,
 535  *               if necessary
 536  * @ip: the inode for this reservation
 537  */
 538 int gfs2_qa_get(struct gfs2_inode *ip)
 539 {
 540         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 541         struct inode *inode = &ip->i_inode;
 542
 543         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 544                 return 0;
 545
 546         spin_lock(&inode->i_lock);
 547         if (ip->i_qadata == NULL) {
 548                 struct gfs2_qadata *tmp;
 549
 550                 spin_unlock(&inode->i_lock);
 551                 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
 552                 if (!tmp)
 553                         return -ENOMEM;
 554
 555                 spin_lock(&inode->i_lock);
 556                 if (ip->i_qadata == NULL)
 557                         ip->i_qadata = tmp;
 558                 else
 559                         kmem_cache_free(gfs2_qadata_cachep, tmp);
 560         }
 561         ip->i_qadata->qa_ref++;
 562         spin_unlock(&inode->i_lock);
 563         return 0;
 564 }
 565
 566 void gfs2_qa_put(struct gfs2_inode *ip)
 567 {
 568         struct inode *inode = &ip->i_inode;
 569
 570         spin_lock(&inode->i_lock);
 571         if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
 572                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
 573                 ip->i_qadata = NULL;
 574         }
 575         spin_unlock(&inode->i_lock);
 576 }
 577
 578 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 579 {
 580         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 581         struct gfs2_quota_data **qd;
 582         int error;
 583
 584         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
 585                 return 0;
 586
 587         error = gfs2_qa_get(ip);
 588         if (error)
 589                 return error;
 590
 591         qd = ip->i_qadata->qa_qd;
 592
 593         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
 594             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
 595                 error = -EIO;
 596                 gfs2_qa_put(ip);
 597                 goto out;
 598         }
 599
 600         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
 601         if (error)
 602                 goto out_unhold;
 603         ip->i_qadata->qa_qd_num++;
 604         qd++;
 605
 606         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
 607         if (error)
 608                 goto out_unhold;
 609         ip->i_qadata->qa_qd_num++;
 610         qd++;
 611
 612         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
 613             !uid_eq(uid, ip->i_inode.i_uid)) {
 614                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
 615                 if (error)
 616                         goto out_unhold;
 617                 ip->i_qadata->qa_qd_num++;
 618                 qd++;
 619         }
 620
 621         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
 622             !gid_eq(gid, ip->i_inode.i_gid)) {
 623                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
 624                 if (error)
 625                         goto out_unhold;
 626                 ip->i_qadata->qa_qd_num++;
 627                 qd++;
 628         }
 629
 630 out_unhold:
 631         if (error)
 632                 gfs2_quota_unhold(ip);
 633 out:
 634         return error;
 635 }
 636
 637 void gfs2_quota_unhold(struct gfs2_inode *ip)
 638 {
 639         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 640         u32 x;
 641
 642         if (ip->i_qadata == NULL)
 643                 return;
 644
 645         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
 646
 647         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
 648                 qdsb_put(ip->i_qadata->qa_qd[x]);
 649                 ip->i_qadata->qa_qd[x] = NULL;
 650         }
 651         ip->i_qadata->qa_qd_num = 0;
 652         gfs2_qa_put(ip);
 653 }
 654
 655 static int sort_qd(const void *a, const void *b)
 656 {
 657         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
 658         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 659
 660         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
 661                 return -1;
 662         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
 663                 return 1;
 664         return 0;
 665 }
 666
 667 static void do_qc(struct gfs2_quota_data *qd, s64 change, int qc_type)
 668 {
 669         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 670         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
 671         struct gfs2_quota_change *qc = qd->qd_bh_qc;
 672         s64 x;
 673
 674         mutex_lock(&sdp->sd_quota_mutex);
 675         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
 676
 677         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
 678                 qc->qc_change = 0;
 679                 qc->qc_flags = 0;
 680                 if (qd->qd_id.type == USRQUOTA)
 681                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
 682                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
 683         }
 684
 685         x = be64_to_cpu(qc->qc_change) + change;
 686         qc->qc_change = cpu_to_be64(x);
 687
 688         spin_lock(&qd_lock);
 689         qd->qd_change = x;
 690         spin_unlock(&qd_lock);
 691
 692         if (qc_type == QC_CHANGE) {
 693                 if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
 694                         qd_hold(qd);
 695                         slot_hold(qd);
 696                 }
 697         } else {
 698                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 699                 clear_bit(QDF_CHANGE, &qd->qd_flags);
 700                 qc->qc_flags = 0;
 701                 qc->qc_id = 0;
 702                 slot_put(qd);
 703                 qd_put(qd);
 704         }
 705
 706         if (change < 0) /* Reset quiet flag if we freed some blocks */
 707                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
 708         mutex_unlock(&sdp->sd_quota_mutex);
 709 }
 710
 711 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
 712                                   unsigned off, void *buf, unsigned bytes)
 713 {
 714         struct inode *inode = &ip->i_inode;
 715         struct gfs2_sbd *sdp = GFS2_SB(inode);
 716         struct address_space *mapping = inode->i_mapping;
 717         struct page *page;
 718         struct buffer_head *bh;
 719         u64 blk;
 720         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
 721         unsigned to_write = bytes, pg_off = off;
 722         int done = 0;
 723
 724         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
 725         boff = off % bsize;
 726
 727         page = find_or_create_page(mapping, index, GFP_NOFS);
 728         if (!page)
 729                 return -ENOMEM;
 730         if (!page_has_buffers(page))
 731                 create_empty_buffers(page, bsize, 0);
 732
 733         bh = page_buffers(page);
 734         while (!done) {
 735                 /* Find the beginning block within the page */
 736                 if (pg_off >= ((bnum * bsize) + bsize)) {
 737                         bh = bh->b_this_page;
 738                         bnum++;
 739                         blk++;
 740                         continue;
 741                 }
 742                 if (!buffer_mapped(bh)) {
 743                         gfs2_block_map(inode, blk, bh, 1);
 744                         if (!buffer_mapped(bh))
 745                                 goto unlock_out;
 746                         /* If it's a newly allocated disk block, zero it */
 747                         if (buffer_new(bh))
 748                                 zero_user(page, bnum * bsize, bh->b_size);
 749                 }
 750                 if (PageUptodate(page))
 751                         set_buffer_uptodate(bh);
 752                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
 753                         goto unlock_out;
 754                 if (gfs2_is_jdata(ip))
 755                         gfs2_trans_add_data(ip->i_gl, bh);
 756                 else
 757                         gfs2_ordered_add_inode(ip);
 758
 759                 /* If we need to write to the next block as well */
 760                 if (to_write > (bsize - boff)) {
 761                         pg_off += (bsize - boff);
 762                         to_write -= (bsize - boff);
 763                         boff = pg_off % bsize;
 764                         continue;
 765                 }
 766                 done = 1;
 767         }
 768
 769         /* Write to the page, now that we have setup the buffer(s) */
 770         memcpy_to_page(page, off, buf, bytes);
 771         flush_dcache_page(page);
 772         unlock_page(page);
 773         put_page(page);
 774
 775         return 0;
 776
 777 unlock_out:
 778         unlock_page(page);
 779         put_page(page);
 780         return -EIO;
 781 }
 782
 783 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
 784                                  loff_t loc)
 785 {
 786         unsigned long pg_beg;
 787         unsigned pg_off, nbytes, overflow = 0;
 788         int pg_oflow = 0, error;
 789         void *ptr;
 790
 791         nbytes = sizeof(struct gfs2_quota);
 792
 793         pg_beg = loc >> PAGE_SHIFT;
 794         pg_off = offset_in_page(loc);
 795
 796         /* If the quota straddles a page boundary, split the write in two */
 797         if ((pg_off + nbytes) > PAGE_SIZE) {
 798                 pg_oflow = 1;
 799                 overflow = (pg_off + nbytes) - PAGE_SIZE;
 800         }
 801
 802         ptr = qp;
 803         error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
 804                                        nbytes - overflow);
 805         /* If there's an overflow, write the remaining bytes to the next page */
 806         if (!error && pg_oflow)
 807                 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
 808                                                ptr + nbytes - overflow,
 809                                                overflow);
 810         return error;
 811 }
 812
 813 /**
 814  * gfs2_adjust_quota - adjust record of current block usage
 815  * @ip: The quota inode
 816  * @loc: Offset of the entry in the quota file
 817  * @change: The amount of usage change to record
 818  * @qd: The quota data
 819  * @fdq: The updated limits to record
 820  *
 821  * This function was mostly borrowed from gfs2_block_truncate_page which was
 822  * in turn mostly borrowed from ext3
 823  *
 824  * Returns: 0 or -ve on error
 825  */
 826
 827 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 828                              s64 change, struct gfs2_quota_data *qd,
 829                              struct qc_dqblk *fdq)
 830 {
 831         struct inode *inode = &ip->i_inode;
 832         struct gfs2_sbd *sdp = GFS2_SB(inode);
 833         struct gfs2_quota q;
 834         int err;
 835         u64 size;
 836
 837         if (gfs2_is_stuffed(ip)) {
 838                 err = gfs2_unstuff_dinode(ip);
 839                 if (err)
 840                         return err;
 841         }
 842
 843         memset(&q, 0, sizeof(struct gfs2_quota));
 844         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
 845         if (err < 0)
 846                 return err;
 847
 848         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
 849         err = -EIO;
 850         be64_add_cpu(&q.qu_value, change);
 851         if (((s64)be64_to_cpu(q.qu_value)) < 0)
 852                 q.qu_value = 0; /* Never go negative on quota usage */
 853         qd->qd_qb.qb_value = q.qu_value;
 854         if (fdq) {
 855                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
 856                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
 857                         qd->qd_qb.qb_warn = q.qu_warn;
 858                 }
 859                 if (fdq->d_fieldmask & QC_SPC_HARD) {
 860                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
 861                         qd->qd_qb.qb_limit = q.qu_limit;
 862                 }
 863                 if (fdq->d_fieldmask & QC_SPACE) {
 864                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
 865                         qd->qd_qb.qb_value = q.qu_value;
 866                 }
 867         }
 868
 869         err = gfs2_write_disk_quota(ip, &q, loc);
 870         if (!err) {
 871                 size = loc + sizeof(struct gfs2_quota);
 872                 if (size > inode->i_size)
 873                         i_size_write(inode, size);
 874                 inode->i_mtime = inode->i_atime = current_time(inode);
 875                 mark_inode_dirty(inode);
 876                 set_bit(QDF_REFRESH, &qd->qd_flags);
 877         }
 878
 879         return err;
 880 }
 881
 882 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 883 {
 884         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
 885         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 886         struct gfs2_alloc_parms ap = { .aflags = 0, };
 887         unsigned int data_blocks, ind_blocks;
 888         struct gfs2_holder *ghs, i_gh;
 889         unsigned int qx, x;
 890         struct gfs2_quota_data *qd;
 891         unsigned reserved;
 892         loff_t offset;
 893         unsigned int nalloc = 0, blocks;
 894         int error;
 895
 896         error = gfs2_qa_get(ip);
 897         if (error)
 898                 return error;
 899
 900         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
 901                               &data_blocks, &ind_blocks);
 902
 903         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
 904         if (!ghs) {
 905                 error = -ENOMEM;
 906                 goto out;
 907         }
 908
 909         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
 910         inode_lock(&ip->i_inode);
 911         for (qx = 0; qx < num_qd; qx++) {
 912                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
 913                                            GL_NOCACHE, &ghs[qx]);
 914                 if (error)
 915                         goto out_dq;
 916         }
 917
 918         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 919         if (error)
 920                 goto out_dq;
 921
 922         for (x = 0; x < num_qd; x++) {
 923                 offset = qd2offset(qda[x]);
 924                 if (gfs2_write_alloc_required(ip, offset,
 925                                               sizeof(struct gfs2_quota)))
 926                         nalloc++;
 927         }
 928
 929         /*
 930          * 1 blk for unstuffing inode if stuffed. We add this extra
 931          * block to the reservation unconditionally. If the inode
 932          * doesn't need unstuffing, the block will be released to the
 933          * rgrp since it won't be allocated during the transaction
 934          */
 935         /* +3 in the end for unstuffing block, inode size update block
 936          * and another block in case quota straddles page boundary and
 937          * two blocks need to be updated instead of 1 */
 938         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
 939
 940         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
 941         ap.target = reserved;
 942         error = gfs2_inplace_reserve(ip, &ap);
 943         if (error)
 944                 goto out_alloc;
 945
 946         if (nalloc)
 947                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
 948
 949         error = gfs2_trans_begin(sdp, blocks, 0);
 950         if (error)
 951                 goto out_ipres;
 952
 953         for (x = 0; x < num_qd; x++) {
 954                 qd = qda[x];
 955                 offset = qd2offset(qd);
 956                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
 957                 if (error)
 958                         goto out_end_trans;
 959
 960                 do_qc(qd, -qd->qd_change_sync, QC_SYNC);
 961                 set_bit(QDF_REFRESH, &qd->qd_flags);
 962         }
 963
 964         error = 0;
 965
 966 out_end_trans:
 967         gfs2_trans_end(sdp);
 968 out_ipres:
 969         gfs2_inplace_release(ip);
 970 out_alloc:
 971         gfs2_glock_dq_uninit(&i_gh);
 972 out_dq:
 973         while (qx--)
 974                 gfs2_glock_dq_uninit(&ghs[qx]);
 975         inode_unlock(&ip->i_inode);
 976         kfree(ghs);
 977         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
 978                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 979 out:
 980         gfs2_qa_put(ip);
 981         return error;
 982 }
 983
 984 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
 985 {
 986         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
 987         struct gfs2_quota q;
 988         struct gfs2_quota_lvb *qlvb;
 989         loff_t pos;
 990         int error;
 991
 992         memset(&q, 0, sizeof(struct gfs2_quota));
 993         pos = qd2offset(qd);
 994         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
 995         if (error < 0)
 996                 return error;
 997
 998         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
 999         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1000         qlvb->__pad = 0;
1001         qlvb->qb_limit = q.qu_limit;
1002         qlvb->qb_warn = q.qu_warn;
1003         qlvb->qb_value = q.qu_value;
1004         qd->qd_qb = *qlvb;
1005
1006         return 0;
1007 }
1008
1009 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1010                     struct gfs2_holder *q_gh)
1011 {
1012         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1013         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1014         struct gfs2_holder i_gh;
1015         int error;
1016
1017 restart:
1018         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1019         if (error)
1020                 return error;
1021
1022         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1023                 force_refresh = FORCE;
1024
1025         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1026
1027         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1028                 gfs2_glock_dq_uninit(q_gh);
1029                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1030                                            GL_NOCACHE, q_gh);
1031                 if (error)
1032                         return error;
1033
1034                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1035                 if (error)
1036                         goto fail;
1037
1038                 error = update_qd(sdp, qd);
1039                 if (error)
1040                         goto fail_gunlock;
1041
1042                 gfs2_glock_dq_uninit(&i_gh);
1043                 gfs2_glock_dq_uninit(q_gh);
1044                 force_refresh = 0;
1045                 goto restart;
1046         }
1047
1048         return 0;
1049
1050 fail_gunlock:
1051         gfs2_glock_dq_uninit(&i_gh);
1052 fail:
1053         gfs2_glock_dq_uninit(q_gh);
1054         return error;
1055 }
1056
1057 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1058 {
1059         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1060         struct gfs2_quota_data *qd;
1061         u32 x;
1062         int error = 0;
1063
1064         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1065                 return 0;
1066
1067         error = gfs2_quota_hold(ip, uid, gid);
1068         if (error)
1069                 return error;
1070
1071         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1072              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1073
1074         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1075                 qd = ip->i_qadata->qa_qd[x];
1076                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1077                 if (error)
1078                         break;
1079         }
1080
1081         if (!error)
1082                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1083         else {
1084                 while (x--)
1085                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1086                 gfs2_quota_unhold(ip);
1087         }
1088
1089         return error;
1090 }
1091
1092 static int need_sync(struct gfs2_quota_data *qd)
1093 {
1094         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1095         struct gfs2_tune *gt = &sdp->sd_tune;
1096         s64 value;
1097         unsigned int num, den;
1098         int do_sync = 1;
1099
1100         if (!qd->qd_qb.qb_limit)
1101                 return 0;
1102
1103         spin_lock(&qd_lock);
1104         value = qd->qd_change;
1105         spin_unlock(&qd_lock);
1106
1107         spin_lock(&gt->gt_spin);
1108         num = gt->gt_quota_scale_num;
1109         den = gt->gt_quota_scale_den;
1110         spin_unlock(&gt->gt_spin);
1111
1112         if (value < 0)
1113                 do_sync = 0;
1114         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1115                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1116                 do_sync = 0;
1117         else {
1118                 value *= gfs2_jindex_size(sdp) * num;
1119                 value = div_s64(value, den);
1120                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1121                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1122                         do_sync = 0;
1123         }
1124
1125         return do_sync;
1126 }
1127
1128 void gfs2_quota_unlock(struct gfs2_inode *ip)
1129 {
1130         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1131         struct gfs2_quota_data *qda[4];
1132         unsigned int count = 0;
1133         u32 x;
1134         int found;
1135
1136         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1137                 return;
1138
1139         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1140                 struct gfs2_quota_data *qd;
1141                 int sync;
1142
1143                 qd = ip->i_qadata->qa_qd[x];
1144                 sync = need_sync(qd);
1145
1146                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1147                 if (!sync)
1148                         continue;
1149
1150                 spin_lock(&qd_lock);
1151                 found = qd_check_sync(sdp, qd, NULL);
1152                 spin_unlock(&qd_lock);
1153
1154                 if (!found)
1155                         continue;
1156
1157                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1158                 if (bh_get(qd)) {
1159                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1160                         slot_put(qd);
1161                         qd_put(qd);
1162                         continue;
1163                 }
1164
1165                 qda[count++] = qd;
1166         }
1167
1168         if (count) {
1169                 do_sync(count, qda);
1170                 for (x = 0; x < count; x++)
1171                         qd_unlock(qda[x]);
1172         }
1173
1174         gfs2_quota_unhold(ip);
1175 }
1176
1177 #define MAX_LINE 256
1178
1179 static int print_message(struct gfs2_quota_data *qd, char *type)
1180 {
1181         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1182
1183         fs_info(sdp, "quota %s for %s %u\n",
1184                 type,
1185                 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1186                 from_kqid(&init_user_ns, qd->qd_id));
1187
1188         return 0;
1189 }
1190
1191 /**
1192  * gfs2_quota_check - check if allocating new blocks will exceed quota
1193  * @ip:  The inode for which this check is being performed
1194  * @uid: The uid to check against
1195  * @gid: The gid to check against
1196  * @ap:  The allocation parameters. ap->target contains the requested
1197  *       blocks. ap->min_target, if set, contains the minimum blks
1198  *       requested.
1199  *
1200  * Returns: 0 on success.
1201  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1202  *                  quota must allow at least min_req blks for success and
1203  *                  ap->allowed is set to the number of blocks allowed
1204  *
1205  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1206  *                  of blocks available.
1207  */
1208 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1209                      struct gfs2_alloc_parms *ap)
1210 {
1211         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1212         struct gfs2_quota_data *qd;
1213         s64 value, warn, limit;
1214         u32 x;
1215         int error = 0;
1216
1217         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1218         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1219                 return 0;
1220
1221         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1222                 qd = ip->i_qadata->qa_qd[x];
1223
1224                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1225                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1226                         continue;
1227
1228                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1229                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1230                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1231                 spin_lock(&qd_lock);
1232                 value += qd->qd_change;
1233                 spin_unlock(&qd_lock);
1234
1235                 if (limit > 0 && (limit - value) < ap->allowed)
1236                         ap->allowed = limit - value;
1237                 /* If we can't meet the target */
1238                 if (limit && limit < (value + (s64)ap->target)) {
1239                         /* If no min_target specified or we don't meet
1240                          * min_target, return -EDQUOT */
1241                         if (!ap->min_target || ap->min_target > ap->allowed) {
1242                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1243                                                       &qd->qd_flags)) {
1244                                         print_message(qd, "exceeded");
1245                                         quota_send_warning(qd->qd_id,
1246                                                            sdp->sd_vfs->s_dev,
1247                                                            QUOTA_NL_BHARDWARN);
1248                                 }
1249                                 error = -EDQUOT;
1250                                 break;
1251                         }
1252                 } else if (warn && warn < value &&
1253                            time_after_eq(jiffies, qd->qd_last_warn +
1254                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1255                                          * HZ)) {
1256                         quota_send_warning(qd->qd_id,
1257                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1258                         error = print_message(qd, "warning");
1259                         qd->qd_last_warn = jiffies;
1260                 }
1261         }
1262         return error;
1263 }
1264
1265 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1266                        kuid_t uid, kgid_t gid)
1267 {
1268         struct gfs2_quota_data *qd;
1269         u32 x;
1270         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1271
1272         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1273             gfs2_assert_warn(sdp, change))
1274                 return;
1275         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1276                 return;
1277
1278         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1279                                  ip->i_qadata->qa_ref > 0))
1280                 return;
1281         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1282                 qd = ip->i_qadata->qa_qd[x];
1283
1284                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1285                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1286                         do_qc(qd, change, QC_CHANGE);
1287                 }
1288         }
1289 }
1290
1291 int gfs2_quota_sync(struct super_block *sb, int type)
1292 {
1293         struct gfs2_sbd *sdp = sb->s_fs_info;
1294         struct gfs2_quota_data **qda;
1295         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1296         unsigned int num_qd;
1297         unsigned int x;
1298         int error = 0;
1299
1300         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1301         if (!qda)
1302                 return -ENOMEM;
1303
1304         mutex_lock(&sdp->sd_quota_sync_mutex);
1305         sdp->sd_quota_sync_gen++;
1306
1307         do {
1308                 num_qd = 0;
1309
1310                 for (;;) {
1311                         error = qd_fish(sdp, qda + num_qd);
1312                         if (error || !qda[num_qd])
1313                                 break;
1314                         if (++num_qd == max_qd)
1315                                 break;
1316                 }
1317
1318                 if (num_qd) {
1319                         if (!error)
1320                                 error = do_sync(num_qd, qda);
1321                         if (!error)
1322                                 for (x = 0; x < num_qd; x++)
1323                                         qda[x]->qd_sync_gen =
1324                                                 sdp->sd_quota_sync_gen;
1325
1326                         for (x = 0; x < num_qd; x++)
1327                                 qd_unlock(qda[x]);
1328                 }
1329         } while (!error && num_qd == max_qd);
1330
1331         mutex_unlock(&sdp->sd_quota_sync_mutex);
1332         kfree(qda);
1333
1334         return error;
1335 }
1336
1337 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1338 {
1339         struct gfs2_quota_data *qd;
1340         struct gfs2_holder q_gh;
1341         int error;
1342
1343         error = qd_get(sdp, qid, &qd);
1344         if (error)
1345                 return error;
1346
1347         error = do_glock(qd, FORCE, &q_gh);
1348         if (!error)
1349                 gfs2_glock_dq_uninit(&q_gh);
1350
1351         qd_put(qd);
1352         return error;
1353 }
1354
1355 int gfs2_quota_init(struct gfs2_sbd *sdp)
1356 {
1357         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1358         u64 size = i_size_read(sdp->sd_qc_inode);
1359         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1360         unsigned int x, slot = 0;
1361         unsigned int found = 0;
1362         unsigned int hash;
1363         unsigned int bm_size;
1364         u64 dblock;
1365         u32 extlen = 0;
1366         int error;
1367
1368         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1369                 return -EIO;
1370
1371         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1372         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1373         bm_size *= sizeof(unsigned long);
1374         error = -ENOMEM;
1375         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1376         if (sdp->sd_quota_bitmap == NULL)
1377                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1378                                                  __GFP_ZERO);
1379         if (!sdp->sd_quota_bitmap)
1380                 return error;
1381
1382         for (x = 0; x < blocks; x++) {
1383                 struct buffer_head *bh;
1384                 const struct gfs2_quota_change *qc;
1385                 unsigned int y;
1386
1387                 if (!extlen) {
1388                         extlen = 32;
1389                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1390                         if (error)
1391                                 goto fail;
1392                 }
1393                 error = -EIO;
1394                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1395                 if (!bh)
1396                         goto fail;
1397                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1398                         brelse(bh);
1399                         goto fail;
1400                 }
1401
1402                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1403                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1404                      y++, slot++) {
1405                         struct gfs2_quota_data *qd;
1406                         s64 qc_change = be64_to_cpu(qc->qc_change);
1407                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1408                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1409                                                 USRQUOTA : GRPQUOTA;
1410                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1411                                                       be32_to_cpu(qc->qc_id));
1412                         qc++;
1413                         if (!qc_change)
1414                                 continue;
1415
1416                         hash = gfs2_qd_hash(sdp, qc_id);
1417                         qd = qd_alloc(hash, sdp, qc_id);
1418                         if (qd == NULL) {
1419                                 brelse(bh);
1420                                 goto fail;
1421                         }
1422
1423                         set_bit(QDF_CHANGE, &qd->qd_flags);
1424                         qd->qd_change = qc_change;
1425                         qd->qd_slot = slot;
1426                         qd->qd_slot_count = 1;
1427
1428                         spin_lock(&qd_lock);
1429                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1430                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1431                         atomic_inc(&sdp->sd_quota_count);
1432                         spin_unlock(&qd_lock);
1433
1434                         spin_lock_bucket(hash);
1435                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1436                         spin_unlock_bucket(hash);
1437
1438                         found++;
1439                 }
1440
1441                 brelse(bh);
1442                 dblock++;
1443                 extlen--;
1444         }
1445
1446         if (found)
1447                 fs_info(sdp, "found %u quota changes\n", found);
1448
1449         return 0;
1450
1451 fail:
1452         gfs2_quota_cleanup(sdp);
1453         return error;
1454 }
1455
1456 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1457 {
1458         struct list_head *head = &sdp->sd_quota_list;
1459         struct gfs2_quota_data *qd;
1460
1461         spin_lock(&qd_lock);
1462         while (!list_empty(head)) {
1463                 qd = list_last_entry(head, struct gfs2_quota_data, qd_list);
1464
1465                 list_del(&qd->qd_list);
1466
1467                 /* Also remove if this qd exists in the reclaim list */
1468                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1469                 atomic_dec(&sdp->sd_quota_count);
1470                 spin_unlock(&qd_lock);
1471
1472                 spin_lock_bucket(qd->qd_hash);
1473                 hlist_bl_del_rcu(&qd->qd_hlist);
1474                 spin_unlock_bucket(qd->qd_hash);
1475
1476                 gfs2_assert_warn(sdp, !qd->qd_change);
1477                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1478                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1479
1480                 gfs2_glock_put(qd->qd_gl);
1481                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1482
1483                 spin_lock(&qd_lock);
1484         }
1485         spin_unlock(&qd_lock);
1486
1487         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1488
1489         kvfree(sdp->sd_quota_bitmap);
1490         sdp->sd_quota_bitmap = NULL;
1491 }
1492
1493 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1494 {
1495         if (error == 0 || error == -EROFS)
1496                 return;
1497         if (!gfs2_withdrawn(sdp)) {
1498                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1499                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1500                 wake_up(&sdp->sd_logd_waitq);
1501         }
1502 }
1503
1504 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1505                                int (*fxn)(struct super_block *sb, int type),
1506                                unsigned long t, unsigned long *timeo,
1507                                unsigned int *new_timeo)
1508 {
1509         if (t >= *timeo) {
1510                 int error = fxn(sdp->sd_vfs, 0);
1511                 quotad_error(sdp, msg, error);
1512                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1513         } else {
1514                 *timeo -= t;
1515         }
1516 }
1517
1518 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1519         if (!sdp->sd_statfs_force_sync) {
1520                 sdp->sd_statfs_force_sync = 1;
1521                 wake_up(&sdp->sd_quota_wait);
1522         }
1523 }
1524
1525
1526 /**
1527  * gfs2_quotad - Write cached quota changes into the quota file
1528  * @data: Pointer to GFS2 superblock
1529  *
1530  */
1531
1532 int gfs2_quotad(void *data)
1533 {
1534         struct gfs2_sbd *sdp = data;
1535         struct gfs2_tune *tune = &sdp->sd_tune;
1536         unsigned long statfs_timeo = 0;
1537         unsigned long quotad_timeo = 0;
1538         unsigned long t = 0;
1539         DEFINE_WAIT(wait);
1540
1541         while (!kthread_should_stop()) {
1542
1543                 if (gfs2_withdrawn(sdp))
1544                         goto bypass;
1545                 /* Update the master statfs file */
1546                 if (sdp->sd_statfs_force_sync) {
1547                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1548                         quotad_error(sdp, "statfs", error);
1549                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1550                 }
1551                 else
1552                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1553                                            &statfs_timeo,
1554                                            &tune->gt_statfs_quantum);
1555
1556                 /* Update quota file */
1557                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1558                                    &quotad_timeo, &tune->gt_quota_quantum);
1559
1560                 try_to_freeze();
1561
1562 bypass:
1563                 t = min(quotad_timeo, statfs_timeo);
1564
1565                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1566                 if (!sdp->sd_statfs_force_sync)
1567                         t -= schedule_timeout(t);
1568                 else
1569                         t = 0;
1570                 finish_wait(&sdp->sd_quota_wait, &wait);
1571         }
1572
1573         return 0;
1574 }
1575
1576 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1577 {
1578         struct gfs2_sbd *sdp = sb->s_fs_info;
1579
1580         memset(state, 0, sizeof(*state));
1581
1582         switch (sdp->sd_args.ar_quota) {
1583         case GFS2_QUOTA_ON:
1584                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1585                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1586                 fallthrough;
1587         case GFS2_QUOTA_ACCOUNT:
1588                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1589                                                   QCI_SYSFILE;
1590                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1591                                                   QCI_SYSFILE;
1592                 break;
1593         case GFS2_QUOTA_OFF:
1594                 break;
1595         }
1596         if (sdp->sd_quota_inode) {
1597                 state->s_state[USRQUOTA].ino =
1598                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1599                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1600         }
1601         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1602         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1603         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1604         return 0;
1605 }
1606
1607 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1608                           struct qc_dqblk *fdq)
1609 {
1610         struct gfs2_sbd *sdp = sb->s_fs_info;
1611         struct gfs2_quota_lvb *qlvb;
1612         struct gfs2_quota_data *qd;
1613         struct gfs2_holder q_gh;
1614         int error;
1615
1616         memset(fdq, 0, sizeof(*fdq));
1617
1618         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1619                 return -ESRCH; /* Crazy XFS error code */
1620
1621         if ((qid.type != USRQUOTA) &&
1622             (qid.type != GRPQUOTA))
1623                 return -EINVAL;
1624
1625         error = qd_get(sdp, qid, &qd);
1626         if (error)
1627                 return error;
1628         error = do_glock(qd, FORCE, &q_gh);
1629         if (error)
1630                 goto out;
1631
1632         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1633         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1634         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1635         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1636
1637         gfs2_glock_dq_uninit(&q_gh);
1638 out:
1639         qd_put(qd);
1640         return error;
1641 }
1642
1643 /* GFS2 only supports a subset of the XFS fields */
1644 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1645
1646 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1647                           struct qc_dqblk *fdq)
1648 {
1649         struct gfs2_sbd *sdp = sb->s_fs_info;
1650         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1651         struct gfs2_quota_data *qd;
1652         struct gfs2_holder q_gh, i_gh;
1653         unsigned int data_blocks, ind_blocks;
1654         unsigned int blocks = 0;
1655         int alloc_required;
1656         loff_t offset;
1657         int error;
1658
1659         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1660                 return -ESRCH; /* Crazy XFS error code */
1661
1662         if ((qid.type != USRQUOTA) &&
1663             (qid.type != GRPQUOTA))
1664                 return -EINVAL;
1665
1666         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1667                 return -EINVAL;
1668
1669         error = qd_get(sdp, qid, &qd);
1670         if (error)
1671                 return error;
1672
1673         error = gfs2_qa_get(ip);
1674         if (error)
1675                 goto out_put;
1676
1677         inode_lock(&ip->i_inode);
1678         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1679         if (error)
1680                 goto out_unlockput;
1681         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1682         if (error)
1683                 goto out_q;
1684
1685         /* Check for existing entry, if none then alloc new blocks */
1686         error = update_qd(sdp, qd);
1687         if (error)
1688                 goto out_i;
1689
1690         /* If nothing has changed, this is a no-op */
1691         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1692             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1693                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1694
1695         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1696             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1697                 fdq->d_fieldmask ^= QC_SPC_HARD;
1698
1699         if ((fdq->d_fieldmask & QC_SPACE) &&
1700             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1701                 fdq->d_fieldmask ^= QC_SPACE;
1702
1703         if (fdq->d_fieldmask == 0)
1704                 goto out_i;
1705
1706         offset = qd2offset(qd);
1707         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1708         if (gfs2_is_stuffed(ip))
1709                 alloc_required = 1;
1710         if (alloc_required) {
1711                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1712                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1713                                        &data_blocks, &ind_blocks);
1714                 blocks = 1 + data_blocks + ind_blocks;
1715                 ap.target = blocks;
1716                 error = gfs2_inplace_reserve(ip, &ap);
1717                 if (error)
1718                         goto out_i;
1719                 blocks += gfs2_rg_blocks(ip, blocks);
1720         }
1721
1722         /* Some quotas span block boundaries and can update two blocks,
1723            adding an extra block to the transaction to handle such quotas */
1724         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1725         if (error)
1726                 goto out_release;
1727
1728         /* Apply changes */
1729         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1730         if (!error)
1731                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1732
1733         gfs2_trans_end(sdp);
1734 out_release:
1735         if (alloc_required)
1736                 gfs2_inplace_release(ip);
1737 out_i:
1738         gfs2_glock_dq_uninit(&i_gh);
1739 out_q:
1740         gfs2_glock_dq_uninit(&q_gh);
1741 out_unlockput:
1742         gfs2_qa_put(ip);
1743         inode_unlock(&ip->i_inode);
1744 out_put:
1745         qd_put(qd);
1746         return error;
1747 }
1748
1749 const struct quotactl_ops gfs2_quotactl_ops = {
1750         .quota_sync     = gfs2_quota_sync,
1751         .get_state      = gfs2_quota_get_state,
1752         .get_dqblk      = gfs2_get_dqblk,
1753         .set_dqblk      = gfs2_set_dqblk,
1754 };
1755
1756 void __init gfs2_quota_hash_init(void)
1757 {
1758         unsigned i;
1759
1760         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1761                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1762 }